Inversion of Frequency Domain Helicopter Electromagnetic Data for Recognizing Gold Enriched Massive Sulfide Anomaly in  Barika Area, West Azerbaijan, Iran

Shademan, M; Arab-Amiri, A.R; Kheyrollahi, H; Rajabi, D

doi:10.22071/gsj.2015.42192

Inversion of Frequency Domain Helicopter Electromagnetic Data for Recognizing Gold Enriched Massive Sulfide Anomaly in Barika Area, West Azerbaijan, Iran

Document Type : Original Research Paper

Authors

M Shademan ¹

A.R Arab-Amiri ²

H Kheyrollahi ³

D Rajabi ⁴

¹ M. Sc., Faculty of Mining and Petroleum Engineering, University of Tehran, Tehran, Iran

² Associate Professor, Faculty of Mining, Petroleum and Geophysics Engineering, Shahrood University, Shahrood, Iran

³ Ph.D. Student, Amirkabir University of Technology, Tehran; Geological Survey of Iran, Tehran, Iran

⁴ Ph.D. Student, Faculty of Earth Sciences, Shahid Beheshti University, Tehran, Iran

10.22071/gsj.2015.42192

Abstract

Frequency Domain Electromagnetic surveys are being used for various applications like mineral and water exploration, environmental hazards and buried human-made materials because of its resolution and fast acquisition for low depth targets. Resistivity and its depth for each frequency could be calculated in a simpler approach and shorter time than Iterative Inversion Method, Called Straight or Fast Inversion Methods, by assuming earth as a homogeneous half space. Barika’s Anomaly situated in Alut Geology 1:100,000 sheets in west Azerbaijan is studied in order to prospect gold_ lead mineralization which has been detected in systematic geochemical and litho-geochemical surveys. In this paper we studied different Fast Inversion algorithms for synthetic data then applied the best method for real data. Resistivity distribution for each frequency produced and appropriate interpretation according to geology acquired. The results showed that there is a good correlation between low resistivity and shear zones. Also geology map can be modified with higher frequency resistivity.

Keywords

Fast Inversion

Helicopter-Borne Electromagnetic

Massive sulfide

Barika

Iran